Connection Heads
Thermocouple connection heads (also called sensor heads or terminal heads) are
protective enclosures that house the wiring terminals for thermocouples (or RTDs) at
the point where the sensor connects to extension wires or a transmitter. They are
essential for electrical safety, environmental protection, and ease of maintenance.
Key Features
1. Purpose
- Protects the thermocouple junction and wiring from moisture, dust,
vibration, and corrosive environments. - Provides a secure point for electrical connection to transmitters or
extension wires. - Allows easy sensor replacement without disturbing wiring.
2. Construction
- Material: Aluminum, stainless steel, or plastic for hygienic applications.
- Protection rating: Often IP66/IP68 for dust and water protection.
- Internal terminal block: Screw terminals or spring terminals for easy
wiring.
3. Design Variations
- Standard head: basic protection, screw-on cover.
- Explosion-proof: suitable for hazardous areas (ATEX, IECEx certified)..
- Hygienic/sanitary: polished stainless steel, often with Tri-Clamp or
sanitary fittings.
4. Mounting
- Directly on thermowell or probe.
- Some heads have conduit entry points for cable glands.
Advantages
- Protects connections from environmental and mechanical damage.
- Facilitates easy maintenance and sensor replacement.
- Provides robust mounting for temperature transmitters or extension wires.
Applications
- Industrial process lines (chemical, petrochemical, water treatment)
- Food, beverage, and pharmaceutical processing.
- High-temperature furnaces and boilers.
- Hazardous area installations.